In Shore hardness testing, spring force refers to the force applied by a spring-loaded plunger to the surface of the material being tested. The plunger is typically made of a hard material, such as steel, and is designed to penetrate the surface of the material to a specific depth.

The amount of spring force used in Shore hardness testing depends on the specific scale being used, as different scales are designed to measure the hardness of different types of materials. For example, Shore A and Shore D scales, which are commonly used to measure the hardness of rubber and plastic materials, respectively, apply a force of 1 kgf (kilogram-force) and 5 kgf, respectively, to the material being tested.

The spring force is applied to the material over a specified period of time, typically a few seconds, and the depth of penetration is measured and used to calculate the material’s hardness value. The spring mechanism within the durometer ensures that the force applied is consistent and repeatable, which is important for accurate and reliable hardness measurements.

NextGen’s Classic Analogue Shore Durometer system spring force is 8050 mN.

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